Molding-machine.



No. 722,120. PATENTED MAR. 3, 1903. A. LOTZ. MOLDING MACHINE.

APPLICATION FILED MAR. 18, 1902.

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No. 722.120. PATENTED MAR. 3, 1903. A. L OTZ.

MOLDING MACHINE.

APPLICATION IILEDJIAR. 1B, 1902.

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No. 722,120. PATENTED MAR. 3, 1903. A. LOTZ.

MOLDING MACHINE.

APPLICATION FILED MAR. 16; 1902.

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No. v722,120. PATENTED MAR. 3, 1903.

A. LOTZ.

MOLDING MACHINE.

APPLICATION FILED MAR. 18, 1902.

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ALFRED LOTZ, OF MONONGAHELA, PENNSYLVANIA, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO MONONGAHELA FOUNDRY AND FORGE COMPANY, OF MONONGAHELA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

MOLDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 722,120, dated March 3, 1903.

Application. filed March 18, 1902. Serial No. 98,776. (No model.)

To roZZ whom it may concern.-

Be it known that I, ALFRED LoTz, a citizen of the United States, residing at Monongahela, in the county of Washington and State of Pennsylvania, have invented or discovered new and useful Improvements in Molding Machines, of which the following is a specification.

In the accompanying drawings, which make part of this specification, Figure I is a front elevation of my molding-machine, parts being broken away to show concealed parts. Fig. II is an end elevation looking toward the left on Fig. I. Fig. IIIis a plan view, a portion I 5 being broken away. Fig. IV is a section on the line 1V IV of Fig. II.

My invention relates to molding-machines, particularly to that type in which a reciprocatory movement is imparted to the table or pattern-plate, which supports the pattern and flask, whereby the sand is compacted in the flask.

The object of my invention is to provide a molding-machine with an improved means for stripping the mold from the pattern and for automatically stopping the jarring movements of the table after a predetermined number of movements. It is found in practice that in making such articles as pipe-welding balls, Wagon-boxes, and the like a variation of a small fraction of an inch in the size of the mold destroys the article. If the sand be too loose, the casting will be too large, and if the sand is packed too tight the castings will 5 be too small. Hence it is necessary that the number of jarring operations be exactly predetermined.

My invention consists in certain other improvements, which will be hereinafter more particularly described and claimed.

My machine is supported on a suitable baseplate 1, to which are bolted the end uprights or standards 2 and 3, provided at their upper ends with journal-boxes for the driving- 5 shaft 4. The shaft is provided between the journal-boxes and contiguous thereto with hubs, carrying cams 5 5, each of which rises gradually from the hub to a maximum, where it terminates in a radial shoulder, having its base at the hub.

Gdesignatesahollow jarringblock or postrising from the base 1 and terminates a short distance above the shaft 4, which passes through the block, as shown in dotted lines. Reciprocable and guided on this block is the sleeve 5 5 7, having fast to its top the table or patternplate 8, on which the pattern rests, holes 11 being provided therein to receive pins on the bottom of the pattern.

Over each cam 5 is an antifriction-roller 10, having bearing in an extension of the sleeve, and an ear 9, depending from the table 8.

Encircling and reciprocating on the post 6 below the sleeve 7 is a cross-head 12, having front and rear extensions or arms 13, each of which carries a vertical stripping-rod 14: 14., secured in one of the holes 16 by means of a nut 17. The rods 14.- end near the top of the table 8 and are provided with longitudinal bores in which rods 18 fit loosely. Each of these rods carries a pin 19, which has travel in a vertical slot 20 in each stripping-rod 14. Fixed to the upper end of each rod 18 is a horizontal stripping head or bar 21, which rests on the top of the table, as shown in Figs. 7 I and II. The table is provided with front and rear slots 22 to permit the adjustment of the rods 14 in the various holes 16, according to the size of the pattern on the pattern-plate.

Pivoted in extensions 23 at the rear of the machine are two vertical links 24:, forked at their upper ends for the reception of levers 25, which are pivoted therein and extend to the sides of the cross-head 12, to which they are pivoted by pins 26, screwed thereinto. 8 Pivoted in the upper ends of forked links 27, having pivotal movement in ears 28 on the base 1, are the side levers 29 of the treadle, the levers being connected at the front by the cross-bar or treadle-bar30. The rear ends of the treadle-levers 29 are pivoted to the central portion of levers 25 by the pin 31.

The pattern 72 is placed on the table 8 and held from lateral movement by pins therein entered into the holes 11. The usual mold- 5 bottom 69 is placed over the mold and has its 9 ends resting on the stripping heads or bars 21. Sand (represented by 70) having been placed in the flask 71, the shaft 4 is started. The cams 5 engage the rollers 10 and grad- 10o ually raise the table, the stripping-head, and the mold-bottom, together with the pattern and flask, until the radial shoulders of the cams let all of the elevated parts drop. Their fall is suddenly arrested by the j arring-block 6, and the sand is compacted about the pattern. The table is allowed to drop a predetermined number of times, when the shaft 4 is stopped by mechanism presently to be described. The operator then steps on the treadle-bar 30,which raises the levers 25,causing the cross-head 12 to lift the stripping-rods 14 and stripping-heads 21, together with the mold-bottom and the mold, thus leaving the pattern in its lower position on the table. It will be seen that by reason of the pin-andslot connection between the bars 14 and 18 the rise and fall of the table has no effect on the cross-head or the treadle and the several connected links and levers. This is of great importance, as itsaves much wear, noise, and jarring and prevents liability of the parts becoming broken or injuring the operator.

Pivoted to the side of the standard 3 on the pin 32 is a lever 33, carrying at its offset upper end a roller 34 in the path of the left-hand cam 5, as shown in full lines in Fig. I and in dotted lines in Fig. III. A link 35 connects the lever 33 to the lowerend of the bell-crank lever 36, pivoted on the bolt 37. A spring 35, attached to the lever 33, keeps the roller 34 in contact with the cam 5.

Secured on the front of the standard 3 is a U-shaped housing 38, open toward the front. The bolt 37 passes through the sides of the housing. Mounted on this bolt and in the housing is a registering device 39, having at one end a ratchet-wheel 40, whose teeth are engageable by the pawl 41, pivoted to the housing 38 on the bolt 42, and by the pawl 43, pivoted to the upper forward end of bellcrank lever 36 on the bolt 44. Said registering device is provided with a neck 45, on which is wound a cord 46, carrying a Weight 47. The cord is wound on the neck so that the weight will rotate the registering device when released by the pawls 41 and 43. The left-hand wall of the housing 38 has a circle of threaded holes 48, whose numberis the same as the number of teeth on the ratchet wheel 40. A screw-stop 49 may be screwed into any one of the holes 48 and is engaged by stop-lug 50 on the registering device to limit the oscillation thereof.

51 represents the fixed member of a friction-clutch on shaft 4,:and 52 the sliding member thereof, which is secured to the drivingpulley 53, loose on said shaft. To an arm 54, secured to the standard 3, is a clutch-lever 55, which has an eye or opening receiving the outer hub of pulley 53, the eye being connected to the hub by pins 54. A sliding block 56 slides between guides 57 (not shown in Fig. I) and is connected by rod 58 to lever 55, a spring 59 surrounding the rod 58 and pressing against the guides and a shoulder on the rod. The block 56 has a notch 59, openin g upwardly, and a beveled nose 60.

On the top of the housing 38 is pivoted a latch 61, adapted to enter the notch 59 and lock the block in its right-hand position. The latch has secured thereto a pendent lifting-rod 62 in the path of the lug 50, which by engaging the rod 62 lifts the latch out of the notch 59.

Pivoted on the bolt 63 on the front of the housing 38 is lever 64, having on one end a fork, whose upper and lower members 65 and 66 lie beneath the weighted arms of the pawls 43 and 41, respectively.

The left-hand end of lever 64 is forked to receive the pin 67, carried by the arm 68 on the lever 55.

When the machine is ready to start, the clutch-lever is pulled to the right, whereby the nose 60 of the block 56 lifts the latch 61, which falls into the notch 59 just at the moment when the two clutch members 51 and 52 have engaged each other, so as to cause the rotation of shaft 4. When lever 55 is thus operated, the bar 68 operates the lever 64 to cause the fork members 65 and 66 to descend, thus allowing the weighted ends of the pawls 41 and 43 to move the pawls into engagement with the teeth of ratchet-wheel 40. At each revolution of the shaft one of the cams 5 by engagement with roller 34 causes the swinging of the bell-crankle'ver 36. As the pawl 43 is now in engagement with the ratchet-wheel 40 the latter will be rotated one tooth forward at each revolution of the shaft, the pawl 41 holding the ratchetwheel from returning with pawl 43. After a certain number of revolutions of the shaft the lug 50 engages the lower end of rod 62 and pushes the latch 61 out of notch 59, whereupon the spring 59 quickly slides the block 56 away from the latch, separates the clutch members 51 and 52, and causes the fork-fingers to lift the weighted ends of the pawls 41 and 43 from engagement with the ratchet-wheel 40, the weight 47 then acting to return the ratchet-wheel to its original position against the stop 49.

The number of revolutions of the shaft or the number of jarring movements received by the mold can be varied by placing the stop 49 into difierent holes 48. It is clear that the nearer the stop 49 (counting in a direction on the circle of holes 48 opposite the movement of the hands of a clock) is to the bottom of the rod 62 the less the number of operations before the clutch is operated and the registering device returned to the stop. If it were desired to stop the jarring after the sixth movement of the flask, the stop 49 would be placed in the sixth hole from the lower end of rod 62, counting clockwise therefrom, and the lug 50 would be placedbetween the stop and the rod and would be held against the stop by the weight 47 until the machine started.

I have shown my invention in connection with a ratchet-Wheel which may be considered a round rack.

Various modifications may be made which come within the scope of my invention, and I do not desire to be limited to the precise form and arrangement of the various parts thereof except where they are specifically named.

Having described my invention, what I claim is- 1. In a molding-machine, a jarring'mechanism and a movable device for regulating the number of jarring operations, said device returning by a reverse movement to its starting position after each series of operations.

2. In a molding-machine, a jarring mechanism and a permanent registering device for adjustably regulating the number of jarring operations.

3. Ina molding-machine, ajarring mechanism, a permanent registering device for limiting the number of jarring operations, and means for controlling said device to vary the number of operations.

4. In a molding-machine, a jarring mechanism, a permanent rotary registering device for limiting the number of jarring operations, and means for controlling said device to vary the number of operations.

5. In a molding-machine, a jarring mechanism, a registering device for limiting the number of jarring operations, and an adjustable stop for said device for varying the number of said operations.

6. Ina molding-machine, a jarring mechanism, a registering device forlimiting the number of jarring operations, an adjustable stop for said device for varying the number of said operations, and means for returning said device to its starting position after each series of operations.

7. In a molding-machine, a jarring mechanism, a registering device for regulating the number of jarring operations, means for operating said device step by step and holding it at every step, and means for removing said step-by-step operating means and said holding means from said device whereby the latter may return to its starting position.

8. In a molding-machine, a pattern-table, stripping-bars thereon to support the moldbottom, and means for lifting the strippingbars independently of the table, said means including atreadle and connections therefrom to the stripping-bars.

9. In a molding-machine, a stripping device, a lever having a rocking traveling support and an operative connection with said device, and a treadle having a rocking traveling support and connected to said lever.

10. In a molding-machine, a pattern-table, stripping-bars adapted to support a mold-bot tom, a single means for reciprocating said table, bottom and bars, and means for raising said bars and bottom independently of the table, said means being at rest during the reciprocation of the table and bars.

11. In a molding-machine, a pattern-table, a stripping device thereon, means for reciprocating said table and device, and. means for raising said device above the table, said device and raising means being loosely connected at all times, the latter remaining at rest during the reciprocation of the former.

12. In a molding-machine, a pattern-table, a stripping device thereon, means for reciprocating said table and device, and means for raising said device above the table, said device and the last-named means having a pinand-slot connection, the second means remaining at rest during the reciprocation of the said device.

13. In a molding-machine, a pattern-table, a stripping device thereon, a jarring-post, a cross-head thereon, connections from the cross-head to the stripping device, and means for operating the cross-head to lift the stripping device above the table.

14. In a molding-machine, a reciprocable pattern table, stripping heads supported thereon, and means for adjusting the stripping-heads.

15. In a molding-machine, a pattern-table having slots, stripping-heads on the table, a cross-head connected to said heads, and means for adjusting the heads along the slots.

Signed at Pittsburg, Pennsylvania, this 8th day of March, 1902.

ALFRED LOTZ.

Witnesses:

F. N. BARBER, F. E. MUOKLE. 

